All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=855547

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=25cf6fce424defe8038349d964a3cd79480aee4683edfba925ec5ae15eee84c4


Bot(s) for this bug's original alert(s):

linux-perf

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/15698e53240000

📍 Found significant differences after each of 32 commits.
https://pinpoint-dot-chromeperf.appspot.com/job/15698e53240000

Implement a service that delivers password generation requirements by battre@chromium.org
https://chromium.googlesource.com/chromium/src/+/8dd3ab36f76482bcc9b791c390aefd38792f562d
64.42 → 73.96 (+9.537)

Disable IncompatibleApplicationsBrowserTest.InjectIncompatibleDLL in viz_browser_tests in official builds by hans@chromium.org
https://chromium.googlesource.com/chromium/src/+/cfbd764e97f6b82cd5824652212d039a80502e68
73.96 → 64.43 (-9.529)

[Typed URLs] Migrate the history DB to clear orphanaged metadata by jkrcal@chromium.org
https://chromium.googlesource.com/chromium/src/+/42cd4404376ea11577eea7ec68c3e13975d70078
64.43 → 64.67 (+0.2435)

Fix SessionRestoreObserver browser test under PageAlmostIdle experiment. by chrisha@chromium.org
https://chromium.googlesource.com/chromium/src/+/c745083ab1eda5cff9b232a491dfd866081c8338
64.67 → 72.74 (+8.074)

Add UMA logging of WebRTC usage patterns. by hta@chromium.org
https://chromium.googlesource.com/chromium/src/+/de0fd54854f5d27a44835365a60ad4f8ead0f9f5
72.74 → 64.79 (-7.951)

gin: Pass unique_ptr through V8IdleTaskRunner. by jbroman@chromium.org
https://chromium.googlesource.com/chromium/src/+/4ab1ed7fbb62828a0b90dd4ad3f07500ca416b68
64.79 → 74.15 (+9.357)

Allow PrimaryAccountAccessTokenFetcher to be reset from client callback by blundell@chromium.org
https://chromium.googlesource.com/chromium/src/+/a29afeacbd0d2f72af6e7bde75317d59f2d29af1
74.42 → 69.72 (-4.7)

[css-grid] Content Alignment as part of the track sizing algorithm by jfernandez@igalia.com
https://chromium.googlesource.com/chromium/src/+/0429cc5427bad3ca73d5dbd8731fdfbd563e4b4f
69.7 → 69.61 (-0.0883)

Fix missing synced tabs when tabbed activity closed by mastiz@chromium.org
https://chromium.googlesource.com/chromium/src/+/7552e8c80bb4eaba75d58e366e0a9086979d77a6
69.61 → 66.66 (-2.955)

Silence 64 to 32 bit truncation errors on WTF strings. by dtapuska@chromium.org
https://chromium.googlesource.com/chromium/src/+/7223839e7e8236001185e2dcec521261debc8eb1
66.58 → 57.46 (-9.117)

Plumb URLLoadOptions to MojoAsyncResourceHandler by shimazu@chromium.org
https://chromium.googlesource.com/chromium/src/+/c6185fc9e4b7ae4e7433008bcc9e6c9a8f2c1887
57.45 → 57.64 (+0.1913)

Remove temporary histogram used to debug https://crbug.com/818040 by wub@chromium.org
https://chromium.googlesource.com/chromium/src/+/96756b2f44872b07f81097309b34e89f204c6f2b
57.59 → 55.85 (-1.745)

Use FastForwardUntilNoTasksRemain in SpdySessionTests. by bnc@chromium.org
https://chromium.googlesource.com/chromium/src/+/43b79f48f272f6b236404922db14552351beb7d5
55.88 → 55.94 (+0.05822)

In QUIC, move packet number processing from ProcessIetfPacketHeader to ProcessIetfDataPacket. Not protected because this has no effect until client starts speaking IETF QUIC. by fayang@chromium.org
https://chromium.googlesource.com/chromium/src/+/83cfe106ba2f036d09dcb1de609e95116ffa9260
55.94 → 55.79 (-0.156)

Surface synchronization: Accept update from parent if embed token changed by fsamuel@chromium.org
https://chromium.googlesource.com/chromium/src/+/eed1194297dbe8160533ae40eca57f0a16a40cdf
55.79 → 54.39 (-1.4)

Add a new emphasis level to LayoutProvider by ftirelo@chromium.org
https://chromium.googlesource.com/chromium/src/+/99db48b6e238fb78979aff66834d2a391ae34d43
54.43 → 57.77 (+3.335)

Roll AFDO from 69.0.3455.1_rc-r1 to 69.0.3456.0_rc-r1 by afdo-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
https://chromium.googlesource.com/chromium/src/+/a964355e4ba20eaae5927c66745a981568b81498
57.71 → 55.07 (-2.644)

Add OutputDevice to audio service. by marinaciocea@chromium.org
https://chromium.googlesource.com/chromium/src/+/df82bdd1fae72b438391543ef08b5e1cfa39453e
55.07 → 59.04 (+3.97)

presentation feedback: Add a flag for failure. by sadrul@chromium.org
https://chromium.googlesource.com/chromium/src/+/8a7d03cd902f4db2ba87bedaff3553b67aba5369
59 → 58.66 (-0.3395)

SyncPrefs: extract CryptoSyncPrefs interface and use in SyncServiceCrypto by treib@chromium.org
https://chromium.googlesource.com/chromium/src/+/028126874ecd8f7b16e10399858fb7999b9bf7a1
58.66 → 54.26 (-4.397)

Use mojo::Clone instead of walking vectors by adithyas@chromium.org
https://chromium.googlesource.com/chromium/src/+/25d5e117dcbeeae6238c71f6d8ff2ca9bd51ce81
54.26 → 54.58 (+0.3136)

Extract all vote uploading logic from PasswordFormManager. by dvadym@chromium.org
https://chromium.googlesource.com/chromium/src/+/f39d086cbdbb1c00307912f6eadf1556fb0d99cb
54.57 → 55.37 (+0.7939)

Fix tab shape of tabbed pane in kVertical mode by wutao@chromium.org
https://chromium.googlesource.com/chromium/src/+/6d56e5b6a0ffc389e46d784bf4a1f64bc7bc6a9b
55.33 → 57.66 (+2.33)

Fix bug toggling incognito mode while scrolling in Android tab switcher by rlanday@chromium.org
https://chromium.googlesource.com/chromium/src/+/750082e000c568fae19099fd0544aed89c60a41f
57.67 → 54.54 (-3.129)

cros: Smoothen the transition to views login screen by wzang@chromium.org
https://chromium.googlesource.com/chromium/src/+/73349728077e46a781c62bcfb20a7d3b59eb346e
54.54 → 57.77 (+3.222)

app_list: clean up desktop UserManager webui. by hejq@google.com
https://chromium.googlesource.com/chromium/src/+/c84c52ed1ce9b9240da0c3c240d4e164a8b2c617
57.77 → 55.55 (-2.219)

<b>[RootLayerScrolls] Cleanup: frame<->contents conversion is obsolete</b> by szager@chromium.org
https://chromium.googlesource.com/chromium/src/+/5f0a2ca363c26f6d913730d4f137fca97543f19b
55.55 → 55.43 (-0.1191)

<b>media: fix operator< for VideoCaptureDeviceDescriptor</b> by shik@chromium.org
https://chromium.googlesource.com/chromium/src/+/2310c2c9be35da4431986d64ea51dd67578d1046
55.42 → 58.49 (+3.071)

[DevTools] Throttle error pages so that we attach to them in time by dgozman@chromium.org
https://chromium.googlesource.com/chromium/src/+/81cbb1741bd77536a9e0369b15a6fee7f48fc53c
58.53 → 55.62 (-2.917)

Rework "Make common page base class." by tsepez@chromium.org
https://pdfium.googlesource.com/pdfium/+/101535f463dda5766f99b66f383672d5898556fe
55.62 → 56.87 (+1.257)

Remove explicit calls to FXFT_Clear_Face_External_Stream(). by tsepez@chromium.org
https://pdfium.googlesource.com/pdfium/+/909c6e7d2623f76dee27502d693f8b4fbb8b7649
56.87 → 56.7 (-0.1736)

Roll src/third_party/pdfium 755b0e5f7151..82c730bf83c7 (3 commits) by pdfium-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com
https://chromium.googlesource.com/chromium/src/+/3c766846e9e2a1455c1fd0cea79b91dddebf7eb9
56.7 → 53.31 (-3.39)

Assigning to sheriff dsinclair@chromium.org because "Roll src/third_party/pdfium 755b0e5f7151..82c730bf83c7 (3 commits)" is a roll.

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

Looking at the graphs linked in #c1, the benchmark seems to be back to normal after #567990 or so. Doesn't seem to be anything to be done here, so WontFix?

Is the sensitivity threshold for this metric set too low?

This is won't fix. The cause was my change and it was reverted.. https://chromium.googlesource.com/chromium/src/+/cb0687b15648dd8f442edf287300aba81203c246